Automation GUI missing Event trigger?

New (well, three-day-old) installation of HA OS, and trying to create an Automation using a timer.finished event as trigger, but the trigger GUI doesn’t have an option for “Event”:

Am I wrong to assume there should be one? The docs seems to imply it. There’s “Manual event”, but that seems to bypass the normal UI approach.

I’m sure I could just do it in YAML, but I’m really trying to stick to the GUI approach as much as possible, at least for now.

-Scott

Manual event is correct - but you’re right, the GUI doesn’t give you much help.